using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using MsgBackend.Api.Repository;
using Microsoft.EntityFrameworkCore;
using MsgBackend.Api.ParamModel;
using Microsoft.IdentityModel.Tokens;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using System.Text;

namespace MsgBackend.Api
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        private string allowCors="AllowCors";
        public IConfiguration Configuration { get; }
 
        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            //跨域
            services.AddCors(Options=>{
                Options.AddPolicy(allowCors,builder =>
                {
                    builder.AllowAnyHeader()
                    .AllowAnyMethod()
                    .AllowAnyOrigin();
                });
            });

            // 注册数据库上下文到容器
            services.AddDbContext<MsgBackend.Api.Data.MsgDb>(options => options.UseSqlServer());

            // 注册对数据库的基本操作服务到容器
            services.AddScoped(typeof(IRepository<>), typeof(EfRepository<>));
            services.AddControllers();
              services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
         .AddJwtBearer(option =>
         {
             // 是否要求使用https
             option.RequireHttpsMetadata = false;
             // 是否保存token
             option.SaveToken = true;
             // 使用配置中间件，获得token的配置
             var tokenParamter = Configuration.GetSection("TokenParamter").Get<TokenParamter>();
             // 验证器的核心属性
             option.TokenValidationParameters = new TokenValidationParameters
             {
                 ValidateIssuerSigningKey = true,//要不要验证生成token的密钥
                 IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(tokenParamter.Secret)),
                 ValidateIssuer = true, // 要不要验证发行token的人（个人或者组织）
                 ValidIssuer = tokenParamter.Issuer,
                 ValidateAudience = false // 是否验证受众
             };
         });

    
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();

            }
            

            app.UseRouting();

            app.UseAuthorization();

            // 跨域
            app.UseCors(allowCors);

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
        }
    }
}
